The BEST & WORST trick you ever seen/played on your friend?

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everybody has got a devil in our mind...sometimes we can't control it and it's fun to play trick with our friends...once upon the time when i was studying in Aus, we used to put salt in my housemate's bubble tea cup, and he made the other korean girl drunk and put toothpaste on her hand, then reaching the hair into her nostril, so that she felt itchy and scratches her nose with her toothpasted hand, you can see what happened on her face....and my evil housemate just took video for the whole scene... what's the best or worse trick you ever seen/played on your friend?